一种低延迟三电平APF的方案设计及仿真研究

Design of a Low-delay Three Level Active Power Filter System Scheme and Its Simulation Analysis

为实现谐波检测低延时与补偿电流跟踪控制的高实时性,以此提升三电平有源电力滤波器(active power filter,APF)的动态响应性能与稳态滤波精度。设计一种低延迟三电平APF系统方案:用移动窗积分算法降低ip-iq检测中常用二阶巴特沃斯(butterworth)低通的延迟时间;提出运用基于等距结点牛顿后差插值的瞬态重复校正预测控制方案,实现传统电压空间矢量脉调(space vector pulse width modulation,SVPWM)与无差拍算法的复合控制策略,消除传统SVPWM控制拍数的延迟。Matlab对系统方案仿真对比:三电平APF系统采用低延迟方案时启动阶段响应快且稳,负载突变后过渡响应快,稳态总谐波畸变率(total harmonic distortion,THD)为1.36%,具备明显优势。研究表明:低延迟三电平APF系统方案通过降低谐波检测延迟与电流跟踪控制延迟,提高了APF系统的滤波性能。

In order to achive low delay of harmonic detection and high real-time of current tracking control to improve the dynamic performance and steady filtering accuracy of three level active power filter（ APF）. The paper designed a low latency system of three level APF： commonly used second-order butterworth low-pass filter longger delay is reduced by moving window integration algorirhm; Propose application of transient repetition correction prediction control based on equidistant nodes Newton rear differential interpolation,and beat number delay of conventional space vector pulse width modulation is solved by complex cotorl strategies of deadbeat algorirhm and svpwm.compared matlab simulation research： three level apf could achive fast start-up phase respense and better stability by using low latency system,and has fast transition speed under load mutation and 1. 36% total harmonic distortion,these are obvios advantages. analysis shows： the low latency three level active power have improved system filtering performance by renducing harmonic detection delay and current tracking control delay.